System of pressure and temperature regulation for heaters



D. J. JONES 1,780,393

SYSTEM OF PRESSURE AND TEMPERATURE REGULATION FOR HEATERS.

Nov; -4, 1 930.

Filed May 24, 1929 Patented Nov. 4, 1 930 UNITED STATES PATENT OFFICE DAVID J. JONES, OF CHICAGO, ILLINOIS, ASSIGNOR TO BELL & GOSSETT COMPANY, 01 CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS sYsrEmor' PRESSURE AND TEMPERATURE REGULATION iron. HEATERS Application Med m 24, 1929. Serial in. 365,100.

My present invention relates to the prowill be maintained at a predetermined minimum, the boiler will be protected against excessive pressure or heat and the instrumentality will also respond to the heat requlrements'of the premises that it is designed to.

heat. Such devices have been associated with heaters for thersame urpose, but, so far as is known,.-'in other an more complicated circuits. In the circuit herein described, as will be hereafter seen, the circuit closed through the thermostat passes through the respective instruments so that not on y is the apparatus controlled as desired,'but also the parts may be tested and supervised by a manipulation of the thermostat as each part has to harmoniousl function to maintain the heater in operation. For the purpose of simplifying the practical employment of my 1nvention I have provided a terminal board which may be installed in a convenient location and to which the several instrumentalities may be easily wired.

I have illustrated my invention in the accompanying' drawings in which- Fig. 1 is a diagrammatic illustratlon of a boiler associated with an oil heater, a pressurestat, an aquastat and room thermostat and my terminal-panel with the wiring leading therefrom to the respective elements.

Fig. 2 is a schematic illustration of a mer cury switch, the part of the pressurestat, aquastat and room thermostat WhlGh 18 mcluded in my circuit.

Fig. 3 is the diagram of my circuit, and Fi 4 is a diagram of the wiring including t e terminal panel.

Similar reference characters refer to similar parts throughout the several views.

In Fig. 1 the boiler 5'is shown provided with a form of oil burner o erated by a motor 6. Theboiler is'provi ed with a pressurestat A, the purpose of which is to open the motor circuit when thepressure reaches a predetermined point, which, for heating, would not be over 10 pounds. The boiler 1s also provided with an aquastat B, the purpose of which in mycircuit is to maintain the boiler water at a predetermined temperature below steam or vapor producing temperatures. The system also includes a room thermostat C located in some suitable portion of the premises, the-purpose of which 1s to close the circuit when the temperature of the premises falls below a predetermined point, said Fahrenheit, and to-open the circuit when the temperature of the premises has reached the desired predetermined temperature. Pressurestats, aquastats and thermostats may be obtained in the market provided with the circuit opening and closing mercury switch shown in Fig. 2. Other instrumentalities for accomplishing the same purpose may be employed in the practice of my invention, but as the device here shown is J economical, positive and dependable, I have illustrated it as a simple means of carrying out my invention. The mercury switch comprises a sealed tube 7 containing a small quantity of mercury 8. Two pairs of terminals 1 and 2 and 3 and 4 are fused into one of the walls of the tube 7 at either end thereof so mercury thereb closing the circuit in which the outer end 0 these terminals are included.

As seen most clearly in Fig. 3' the terminals 1 and 2 of the mercury switch employed in the pressurestat A are alone included in One of the supply conductors my circuit. 9 connects with terminal 1 of the pressurestat A. Terminals 2 and 3 oi the switches,

thermostat 0. Conductor 11 is connected by.

conductor 15 with a pole of the motor 6 and the supply conductor 16v connects with the other pole of -the motor. :The switch of the pressurestat A closes when the mercury submerges the' ends" of terminals 1 and 2and 7 remains in that position until the pressure and 4 are disconnected.

.maintain inthe premises.

inf the boiler exceeds the predetermined amount fon'which the instrument is set.

The switch in theaquastat' B closes the circuit when its terminals 3 and 4 are submerged'in the mercury, and after-the boiler water has reached the predetermined heat, say 180 01' "190? Fahrenheit, for which the instrument'isset, assumes the position shown in Fig.3, in which'terminals 1 and 2 are submerged in the mercury" andterminals 3 When'the temperaturein the premises drops below the desired point at which point .thethermostatC is adjusted, the tube 7 of 4 the thermostat shifts to submerge the ter-.-'

minals 3 and 4, thereby closing the circuit,

I and'when the temperature of the premises has risen to the required amount, the tube. 7 shifts to uncover the terminals 3 and 4 and to submerge the terminals 1 and 2, which latter position is shown in Fig. 3. p

" To initially fire the boiler employing the circuit thus far described-the oil burner is lit and the thermostat C shifted to close terb minals 1- and 2. When the boiler water has reached its predetermined temperature, the.

tube 7 of the a uastat B'shifts to the position shown in ig. 3 and the thermostat is adjusted to the" temperature it is desired to Thereafter the system is fully automatic, the boiler water temperature being maintained at .a desired minimum and additionalfiring' secured to maintain the premises at a desired temperature.

v The'pressurestat A is'set at a point where except when unexpected pressure is mad-- vertently developed it only opens after the requirements oftheaquastat B and thermostat C have been met.- When the aquastat B calls for heat the circuit closes through terminals 1 a-nd2 of A, terminals 3 and 4 of B and terminals 1 and 2 of C. When the thermostat C calls for heat the circuit closes through terminals 1 and 2 ofthe pressurestat' A, terminals land 2 of the aquastat Band terminals 3 and 4 of thermostat C. I

It will be noted that in the circuit thus fa I described, if the 'aquastat and thermostat should assume positions calling for'heat at the same time the circuit would be opened and as firing would be discontinued heat 'would not be generated so as to'cause either of these instrumentalities to assume an off 1 position. Such a condition is not at all likely to arise in practical operation, but-to maintain the system in operation even upon the development of'such a condition I employ the conductor X connecting conductors 14. and 15. .Whenconductor Xis employed inmy circuit aquastat B may close independotherwise inoperation." In.Fig.- -4 I.hav e illustrated a panel 18 and wiring diagram suitable for the practical employment of my circuit and ently of the position of thermostat C which will-insurethe firing of the-boiler until aquastat B is in off position. Thermostat C cannot close the circuit until aquastat B has opened, but therewill be no occasion for it to function until aquastat B is opened as the aqu'astat will be causing the firing of the boiler until it is in off position.

templated are often employed for heating aseryice hot. water supply throughout the year and it may be desired to eliminate the thermostat from the system in the summer season,.I have interposed" the switch 17 in conductor 13, which will prevent the system Inasmuch as boilers such as are here c onrespondingv to thethermostat but leave. it

- terminal system. This diagram shows a single throw double pole switch 19 and fuse; box 20 which i are usually required by the local ordinances.

The panel 18 is rovided with suitably arranged lengths o buss 'bar 21, 22, 23, 24, and 26. One fuse. is connected byv the conductor. 9* with the buss bar 21. The buss M21 is connected by the conductor 9 with v the terminal 1 of the pressurestat-A. The terminal 2 of the pressurestat is connected through the conductor 12 with the buss bar 22. The buss bar 22 connects through the conductor 12 with terminals 2 and 3- ofthe aquasta't B. Terminal 1 of thelaquastat B connects through the conductor 13 with the pole of-the switch 17. The opposite pole of the switch 17. connects through conductor13" with the buss bar 24, which connectsin turn with terminal 4 of thermostat C. Terminal 4 of aquastat B connects through "conductor 14 with buss bar 23which in turn connects through conductor '14 with terminal 1 of thermostat C and terminals 2 and 3 oftherthrough conductor 16 with the opposite fuse" of fuse box 20.

From the foregoing description taken in connection with the drawings it will be seen l-ln . that I have provided a system of boiler super- I vision and controlwhich will prevent the boil-. er from belng fired to secure an excessive pressure, which will maintain theboiler water at a predetermined minimum temperature and which will respond to the heat requirements of the premises the installation is designed to heat, 1n which system the circuit ycloses.

throu h the respective controlfinst-rumentalithat Y the instrumentalities in question are functioning.

'ties,'-thereby assuring the users of the system Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. In combination a boiler having tiring means therefor, a system c pressure, boiler water temperature and prennses temperature control, comprising a circuit including in se ries the pressure; "2, aquastat, thermostat and firing means, and a branch circuit paralleling said thermostat running from said aquastat to said tiring means.

:2. In combination a boiler having firing means therefor, a system of pressure, boiler water temperature and premises temperature control, comprising a circuit including in series the pressurestat, aquastat, thermostat and firing means with a three way wiring between said aquastat and thermostat.

3. in a system of pressure, boiler water teniperature and premises temperature control, switches for the boiler water and premises temperature control havingpairs of terminals respectively closed in on and oil positions, a terminal of each switch of each pair being connected together-and to terminals of a circuit and the other terminals of said switches being connected in parallel,

4:. In a system of pressure, boiler water temperature and premises temperature control, switches for the boiler water and premises temperature control having pairs of terminals closed respectively in on and. oil positions, a terminal in each position of each switch being connected together and to the terminals of a. circuit and the other terminals of said switches being connected in parallel and a terminal panel to which the several elements of said system are wired.

5. In a system of pressure, boiler water temperature, and premises tennperature control, switches for the boiler water and premises temperature control having pairs of terminals closed respectively in on and oil positions, a terminal in each position of each switch being included. in a circuit, the other terminals of said switches being connected in parallel, and a conductor connecting the conductor between a terminal of the on position of the aquastat and a terminal of the off position of the thermostat wi th the circuit beyond said thermostat.

' 6. In combination a boiler having firing means therefor, a system of pressure boiler water temperature and premises temperature control. comprising a circuit including a two terminal mercury pressure operated switch, a four terminal mercury boiler water temperature operated switch, a terminal of each. pairbeing connected with said pressure open ated switch, and a premises temperature operated mercury switch, one of the free terminals of said boiler water temperature operated switch being in series with. said premises tern perature operated switch and said firing means, and the other free terminal of said boiler water temperature operated switch bemg connected with said firing means in paralswitch.

7, In combination a boiler having firing means therefor, a system of pressure boiler water temperature and premises temperature control, comprising a circuit including a two terminal pressure operated switch, a four terminal boiler water temperature operated switch, a terminal of each pair being connected with said pressure operated switch, and a premises temperature operated switch, one of the free terminals of said boiler water tem 1 control switch, a four terminal low limit cont-rol switch, a terminal of each pair being con- :nected with said high limit control switch,

and a premises temperature operated. switch, one of the free terminals of said. low limit control switch being in series with said premises temperature operated switch and said tiring means, and the other free terminal of said low limit control switch being connected with said firing means in parallel with said temperature operated switch.

DAVID J. JONES.

' lel with said premises temperature operated 

